This is book number 4 in the Survivors series.
"The Theos await you. Only then will we stop the Unwinding."
The threat of invaders is gone, and Earth has been bartered away as a price for peace.
Yet, the human world of New Spero is thriving and full of hope.
Joining the rank of the Gatekeepers, Dean and Mary set off to explore worlds connected by the mysterious portals.
When they stumble upon a strange symbol, they are led to an ancient object, one that sets them on an unstoppable path.
The journey takes them through multiple worlds, before they can find what they're searching for. Long ago, the ancient race called the Theos vanished without a trace, and have been next to forgotten for centuries. Do they still exist?
Dean intends to find out, but when he's faced with the truth, he fears everything he loves will be lost.
The Ancients is the fourth installment of the best-selling Survivors series.